Only #include<memory> when C++ >= C++11

include/exiv2/config.h

@@ -94,14 +94,12 @@ typedef int pid_t;
 //////////////////////////////////////
 
 // https://softwareengineering.stackexchange.com/questions/291141/how-to-handle-design-changes-for-auto-ptr-deprecation-in-c11
+#if __cplusplus >= 201103L
   #include <memory>
   #include <sys/types.h>
   #include <unistd.h>
-#if __cplusplus >= 201103L
   template <typename T>
   using auto_ptr = std::unique_ptr<T>;
-#else
-  using std::auto_ptr;
 #endif
 
 #endif // _CONFIG_H_